165986141 has 2 divisors, whose sum is σ = 165986142. Its totient is φ = 165986140.

The previous prime is 165986137. The next prime is 165986153. The reversal of 165986141 is 141689561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142898116 + 23088025 = 11954^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 165986141 - 2² = 165986137 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165986131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82993070 + 82993071.

It is an arithmetic number, because the mean of its divisors is an integer number (82993071).

Almost surely, 2^165986141 is an apocalyptic number.

It is an amenable number.

165986141 is a deficient number, since it is larger than the sum of its proper divisors (1).

165986141 is an equidigital number, since it uses as much as digits as its factorization.

165986141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 165986141 is about 12883.5608819922. The cubic root of 165986141 is about 549.5711709677.

The spelling of 165986141 in words is "one hundred sixty-five million, nine hundred eighty-six thousand, one hundred forty-one".